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FCC OET-65 RF Exposure Study - Satellite Uplink Facility KNBC Digital Ku-band transportable uplink - “MV38” FCC Maximum Permissible Exposure Levels Source Units Public/uncontrolled area exposure limit 47CFR §1.1310 1 mW/cm2 Occupational/controlled area exposure limit 47CFR §1.1310 5 mW/cm2 Input Data Antenna Diameter datasheet 120.0 cm Antenna surface area calculated 11310 cm2 Sub-reflector diameter measured N/A cm Sub-reflector area calculated N/A cm2 Feed flange diameter estimated 5.400 cm2 Feed flange area calculated 23 Frequency (entry) 14125 MHz Wavelength (speed of light = 299,792,458 m/s) calculated 2.122 cm Transmit power at flange Application 100000 milliwatts Antenna gain datasheet 43.2 dBi Antenna gain factor calculated 20893 Height of base of antenna above ground measured 3.14 m Height of center of antenna above ground measured 3.74 m Minimum Elevation Angle (entry) 15 degrees Minimum Elevation Angle calculated 0.26180 radians FCC Maximum Permissible Exposure (MPE) Results calculated using FCC Bulletin OET-65 (Edition 97-01 August 1997) Uncontrolled Controlled Maximum power density at antenna surface Eq. 11 Pg 27 35.37 mW/cm2 Potential Hazard Potential Hazard Power density at subreflector Eq. 11 Pg 27 0 mW/cm2 N/A N/A Power density at feed flange Eq. 11 Pg 27 17465.56 mW/cm2 Potential Hazard Potential Hazard Extent of near-field Eq. 12 Pg 27 1696 cm Maximum near-field power density Eq. 13 Pg 28 23.42 mW/cm2 Potential Hazard Potential Hazard Aperture efficiency Eq. 14 Pg 28 0.66 Distance to beginning of far-field Eq. 16 Pg 29 4070.82 cm Power density at end of the transition regiion Eq. 17 Pg 29 9.76 mW/cm2 Potential Hazard Potential Hazard Maximum far-field power density Eq. 18 Pg 29 10.033 mW/cm2 Potential Hazard Potential Hazard Main Beam Far-field region safe exposure distances Minimum distance for public/uncontrolled exposure Eq. 18 Pg 29 128.94 meters Height at minimum antenna elevation angle calculated 37.11 meters Horizontal distance calculated 124.55 meters Minimum distance for occupational/controlled exposure Eq. 18 Pg 29 57.66 meters Height at minimum antenna elevation angle calculated 18.66 meters Horizontal distance calculated 55.7 meters Off-Axis Near Field/Transition Region safe exposure distances from antenna (20 dB reduction in power density at distances greater than one antenna diameter from the main beam center.) OET-65 Pg 30 Maximum off-axis near field power density Eq. 13 Pg 28 0.2342 mW/cm2 Below FCC MPE Below FCC MPE Public/uncontrolled exposure off-axis distance Diam/or Eq 17 1.2 meters Occupatonal/controlled exposure off-axis distance Diam/or Eq 17 1.2 meters Off-Axis Far Field safe exposure distances from the antenna (Based on side lobe attenuation required by FCC 25.209(a)(2)) Angle off main beam axis (1 to 48 degrees) (entry) 15 degree(s) Off-axis antenna gain factor OET-65 Pg 30* 2 Minimum distance for public/uncontrolled exposure Eq. 18 Pg 29 ** 40.71 meters * Gain converted from dBi to linear multiple ** If calculated distance is less than the start of the far field region, the distance to the start of the far field region is used. Prepared by Doug Lung, NBC Universal, January 20, 2012


Document Created: 2019-04-25 17:18:19
Document Modified: 2019-04-25 17:18:19
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